L. Razzaboni, L. Casanova, M. Pedeferri, M. Ormellese
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引用次数: 0
摘要
研究了钒盐浓度、浸泡时间、镀液pH和温度等因素对钒基转化涂层(VCC)在碳钢表面化学沉积的影响。其新颖之处在于由含有抗坏血酸和柠檬酸等绿色还原剂的V4+溶液沉积的保护层。发现VCC是无定形的，由富含钒氧化物/氢氧化物的紧密堆积的颗粒组成。采用线性极化电阻法、塔菲尔外推法和电化学阻抗谱法对其耐蚀性进行了评价。这种转化涂层对浸泡在富含硫酸盐和氯化物溶液中的钢基体具有最佳的腐蚀性能。在45°C, pH = 3，沉积时间为10分钟的条件下，0.1 M KVO3溶液达到了最佳效果。后一个参数的更高值并没有提供任何进一步的改善:在脱水过程中形成的裂缝损害了涂层的完整性。
A green vanadium-based formulation for the conversion of steel
ABSTRACT The electroless deposition of a novel vanadium-based conversion coating (VCC) on carbon steel was investigated varying parameters as vanadium salt concentration, immersion time, bath pH and temperature. The novelty resides on the deposition of a protective layer from a V4+ solution comprising green reducing agents like ascorbic and citric acids. The VCC was found to be amorphous, composed by closely packed particles rich in vanadium oxides/hydroxides. Corrosion resistance was evaluated by linear polarization resistance, Tafel extrapolation and electrochemical impedance spectroscopy. Such conversion coating provided an optimum corrosion performance for steel substrates immersed in sulphates and chlorides rich solutions. An optimum was achieved with a 0.1 M KVO3 solution held at 45°C, at pH = 3 and a deposition time of 10 min. Higher values of the latter parameters did not provide any further improvements: the formation of cracks during the dehydration process compromised the coating integrity.
期刊介绍：
Surface Engineering provides a forum for the publication of refereed material on both the theory and practice of this important enabling technology, embracing science, technology and engineering. Coverage includes design, surface modification technologies and process control, and the characterisation and properties of the final system or component, including quality control and non-destructive examination.
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